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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9246d7828cf16dcb96711bc35ea8136a91af103c3a0f4f6f31885a738ea83b22' 
  AND token = 'o8qTdWC9GmFZtPLlblmzgC1kba/1+hdGSUGkl6PQDvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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