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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1c0734118334af852c44cc9770346656dee42d4f8228a32a944e5a6a84e82f' 
  AND token = 'wb7sOD+AQwNEK211OLeCNuUmXiZqAL7SPZX2mnZzGws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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