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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b52a119c17e688daed35bf6bb7e4cec40d49a69fbb661968c1ca7de10e48f9' 
  AND token = 'IFCm3GoJg8lMUNbOlC7/shBFZE9n98KuRQiFEmhoHGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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