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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607ea0e5694a20aa3bb7a1491e032fea353f68b03f1eaec7eb361a450b8d3bc0' 
  AND token = '6s8Lh3Os6O+P+CIh6GM7KuIwm3V3OY9eTM8Zru5u6To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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