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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67a935f5ee03fdf18b14d912716f368fe199875a8009fc2220cf85d6623b9d1' 
  AND token = '9AXEeHkNqyY/j62jjUpLiMh8jA+arbPej952J3+0m9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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