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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c080d99ab23fa1ca19fe39b663c86711ce5286d93d9e18463f0cf835bf619c4' 
  AND token = 'uqTWX/GiZ8jlbmX49Ouh+rsf29OY7RLjZJqTT5IAAf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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