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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a04dde5f87db6f62c92fc68a40e21dd62b584597d29c3116f892e80fe306512' 
  AND token = 'fQCqtIYvpism7zfbH/4FrquUTpGhl90UIUCTyeq8miI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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