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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d0a236a202d0a300ae4c5a8617b6d1ec2a2bc103118611ce3344a070b48667' 
  AND token = '7vQkn86L0tqCrXGXqiICMN874IjGKqTV5Ksw30pdj18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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