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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b674d761c2cb6a9546ee99f089d89279e2f1f92266439ab8906bd3a49cbb929' 
  AND token = 'rqq8rm6v9YQ6B2Ohko/682PYOPFLOWXjAm3Ls1W/YHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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