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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3552603b82924f1a351174ee2f67d5e9c3cae9b8947902ce7f40c45996ec2799' 
  AND token = 'e2cGcoR48wV6E+Pj+AYm3jspCFmJKqd0WjpI2+8DjMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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