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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59867858aa9db2c74625efe36c702b94b107bc0470ea337232fda55f8fdf66e6' 
  AND token = '5Bmpy9WYT82C8Mag/HXNo8Dlpn2FKl+mXVw9Et1n6Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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