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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23b6078ef4e96c82cd17c1c4b256efb0ccccf301ee64640d107d6eff5a6c49f' 
  AND token = '6kC/k3vMXlIDMpD4HYKp+5W1v2y9HVaeevG20uQxs70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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