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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef92bd5d50c40bea73371e67ba81f7a42e968e11d2c46cc11e92a085655df3a' 
  AND token = 'kAxnn56THLbL4bNp0eXL69efFTa7k3BPFcZJw2ofKEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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