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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0c6751426a722455e0855b177608c5060211388acec0dcccbe8b15e2ec6ba2' 
  AND token = 'd/+yIAFgbweWGPXPkj+zELenjOvDKNxmImkA+E5lWck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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