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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0946317a122f0881221b15eaa771852c05a59a01bbd8a8f262911e4c7f4aa20' 
  AND token = 'bKBFBSRlM1c2n1mCthWe2NjEaVWboehYnRcjEIlcjRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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