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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801bf7d3c48ce228c94977454f7556dfd9b0427ec6edefe41d9d27901670d44b' 
  AND token = 'u36QTW2kkO32VaUJRI31oTLPseQ/LsbNR4TAtBgj+v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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