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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a85fd90578f047cdbb67aa7450497dd26c08634cf6d9348e0bf74cb7ed260e' 
  AND token = 'uhdHEo3YZGyiUPXg/AV+k8iv+4xrUfwyuAFuxxM+3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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