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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f81db28856753f152e3298e1420d5cf4e1ac198ce38daca5912d3c3a6fc2bf' 
  AND token = 'Ob9NzwHONJaUBc49HLDE0ef4L0KGeAB1nA+RiYfcJVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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