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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8771816fcecab0a05eb3b673d0794c79d9bab4171f608354a9e8aecf8f3f5f0' 
  AND token = 'qf4pwNgELEXGADe7nPij5v1kAqJrbzrU6apgeg5pDMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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