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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceadd133dc1a849aa1dcaa295c43421f0f1e01d8507cf788f8926a2bf23ead81' 
  AND token = '7kV1sqvext4ZozLypf2+00ugTvvRxe53mkTUysWp6pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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