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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28db08b20cf6f6ff07185f4a81feeaff0bfaf4f86c5d860ef5f8666ed46d45c1' 
  AND token = 'dqxojl6jz6mLZmiVzCqVz6kzsdtYPokvTJSHFNAqj0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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