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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea552306bfa1f86f30e20529f4f15e936fd7f1b1e128b2b00ebf4c7f07f0bcb' 
  AND token = 'DkPx+SpKe0Dx95EFsJeWuti1XXut+dwGHwfE4xKcGAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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