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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd4114349908ead3e102637bde34bf18ac8a3c638e527aa1605839fa993b365' 
  AND token = '0Z6uH53wLypv2BgzRomBgg3dHwNFwYYji27hcPggRfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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