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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54740573bd28ab15e7087d89c15e8e95294001c15f81baf97c19e10f5366a69b' 
  AND token = 'zfopFq5gPO4S8dvNcYwcHa94jNaqpiacvvbuLtVrgAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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