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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4603043032a7498d02ebefde21e7afe3689b15e9f97d07631555bba51f9e194e' 
  AND token = 'HdvOjX1fAv/WonPbReZe1fC27MB8CzAN35AnS2kaIq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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