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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab88074fef0f5f64c4702aeb12154d40dcd1b1debc14e6a010e21bd971d4d4a8' 
  AND token = 'Hre3uJ0SenUxjZQSFPDyBeWJ76Mi7iShCSk+M3P+Gi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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