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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf834e42f9651a40f2bc046d015e7b38ce808c1d6475419a3e22f9379fc1d63' 
  AND token = 'rSHX6cCXZJDEFC3+UuxOxPjDIzY+ZtC87/RTa0uQ0fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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