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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0f2963fa5f092c61ecc42287face37552be876dbc0aa3ef68fa72db96ccfd5' 
  AND token = 'po7KR5yQggVnvk6DG368g4y8u5AkbGkK5VbKh45KCPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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