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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471425ea1d95a4ac8a3ee953df928ab0153a7c70395764cbf07f8c70a3f7a3a5' 
  AND token = 'il3/PzjS8uuvnm/dJNxf81xvjXLlYNKSXxL1/7r+geo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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