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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50150b146be92bd7c4bcd4ebcbd2e1459bb00d7a38444edc4bfd470f6ec97a0c' 
  AND token = 'MhX5bA5CxQO5GTfWpAOr5Mrew76KQP4cS2jZ9/3rxU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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