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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b9ada3d8755a807c098b36b75119f08e066e6ab13c640be57ee5f8d7c13d5e' 
  AND token = '4q0eY8d0W9G4ddwaypTg/Lj2c4mFBCBkc9ajD2hSu1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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