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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba83a0e5254a4d4227278852263c4c1addf86d3718ed44506ce3bfb8ec212c56' 
  AND token = 'ic9G35c5e3kl/Vc1qsJ1fdNOqnQ5C+QHgNLTjNMR6RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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