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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cf7aae62cd46f7f5a51f758e63f40ef987a7602fe653607ccbaadf700ec2e3' 
  AND token = '6BAK2y0dV6sgb9TXWEyxXwvI6CxHjU1OtY8pDnGQomU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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