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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d3e57580877fb6ade91d86f2818247aca8501980019d6ef3df75cac8fd87d3' 
  AND token = 'HET/u29YLN6mxlJxYKGxQbEtz/gU57sxwug5hmKFgEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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