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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bd2daf402664a521d2f97bfb9e7855812026cd3af21832c3b02c963375153e' 
  AND token = 'Dycx5E4mPDcbmHvMWSZE9IzfO/Gt53k07nIDNGW2nXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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