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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b917d4f30b486365a7edf004301e45a12315039cc290550f9195896d93736c2' 
  AND token = 'fKRl/S/1l4dzG+iTUZpmDOy37Rh5If/5eAbQCN7qcXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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