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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe5f86ddb4cff54e64d72a7dd3335e6c7314a54a747b81114498097bbcaf97' 
  AND token = 'Tf02FUP4pt2Nd8ACdoAmeKiljud+AE1jn8iU6TO3OU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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