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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df61daa9ad4e5dcd8f4c363e3b4089f3cdd8c46c75f4a27efae643f3d8e03f6' 
  AND token = '7PU0fZCRM8UE1c9chgGYn0yadyD/ZRv9dJR1P2RE5H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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