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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b423f91a7c9761bb3302874e092e21c5264dd073a9b26bd13b163cb273634095' 
  AND token = 'q4WBaIyrJAOC/JNy7hcl240el5K+uGBmtbYyToV4mEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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