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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ac0c0eafe30ddff65c2b0bdda8811338855d174a94694b3e2554d247dd4cab' 
  AND token = 'aiSt0j7+BH0KnGKIhQ/72DkaSQxNAX8les1RfaQKIcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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