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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43ec6e661f47fc5ac26b77b99dcaa0aef564fc89aa7f54c11219ae719f5c776' 
  AND token = '9jVPDPZguh499rnixhhfrmCkAHN1to5faFAz99NrbWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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