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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4828c55cca91da8581a42376a1ee875fa9b21a433f5891360841578f2972f4f' 
  AND token = 'EB6wq/X2BDj4ApU38QfN4wcFEdWAb0LRiAueS/XspHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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