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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b7698afae35209ef9c77ce82ec931819d8dbe4a2b0c320a1a69cdda25b8a0a' 
  AND token = 'f8QzHHpFkGps/oloP7Sh3pdzvzFou7/IHvnMdHADXbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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