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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0415d08fb3a5b7e2986133a4dc1d901f8db0204b335d25e38dc5cf978afdbd8' 
  AND token = 'TbTij/p2hFOaPmTQPkYG7v027MD39/lmrz4IweYQZ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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