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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae05af5b551adf2f57d4b0d01b8965a2661596b57f3d6972a6a1c85bc9752a8b' 
  AND token = 'XkGXoT9Ulebg0IIaTTiIZaRIPuZT0OEWJm2thC8f9wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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