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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e514670e281f943f1f1eaabfda58e23e0e117248b318622dd2c840ccca41cc' 
  AND token = 'fi86CRSjQ6VihXgZ1l3uvlF+5vr5uaM93EZo4DHS7MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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