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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f091d23ed8e7a141cabbb6086412dd7b8a3411bcd32fc02aa0f1e10e27b30a85' 
  AND token = 'K+72F7HB4ij2kd+WskUVWswmfiB5Yr1iLP8LnEBixjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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