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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09079d24ca46a380b96a28454f2bcc56aa99499bd2742942563e52a087e5837a' 
  AND token = '71mlncHek4q0KWAaE6FgI8Iqt2a9q/Gkr53oAK3aKUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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