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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192e101fd9af85c5e55dd141c4e18482646209dceb0a8285add00c20d61eb82b' 
  AND token = '/kj6gTl7hS9WHz+x2adgRfFTnh4wlHWagNCttLPD2fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}