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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4010284393cfa956b49e351512451737912e4d32fa33ee6b81a11bbc1b951839' 
  AND token = 'UCAcOuK7P6UgpaI68FSeQMJG5O9F6rGtTvzV2gn69yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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