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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f12e4f6df46b793f85d893a0205ec90a903111de0f974c5d89e1b8c50a0390' 
  AND token = '6xevNWlZAZChTqkTCnAbgkc0CbGKMIApXqg7xcl8vZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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