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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d467dcdbb8b4c76f1df73b1f6d86ad2d6fd2e3fdbca314c3efbaf7f6c3f2bc' 
  AND token = 'uBVTnmXy18ss5kwwk3IHcijAgANeLHD1u8E3zXiOraw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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