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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fffc98655eb5aed14e863dc8964a98295e3012ccf8cffbd2a23569d1a15493' 
  AND token = 'Tf9owZV/TyXXF2JcBVhQ7untJqbxwK3biiw7TFbCJdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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