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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef9548aa5b3a96e4c1a445a4ff9515059500703da6fd91808773825e66c1e49' 
  AND token = 'LhBPl+r9rOjv2jv00lWGlwPFn9sYSKa36LW9wYYBuY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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