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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b370497d0d83313a71ce7655d02f7d9d2073f5d5c4f0d98b958fdd909be5e00' 
  AND token = 'CrDMohUWquG6TyZMn6fGdR0W2Fwwln4bQYNe41f6vL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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