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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218afaa359855ea4ca74e394068b7896aa366e12eaaa16fb9b15f18a2572cd75' 
  AND token = 'TfeQBWJ0DrXELS8wHWdSvoSNMfwsU6xiAflQUxMhGyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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