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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efc89198459846abd5ae47d9cebdb831dc5284a52372241abb55b4f4c2cdae4' 
  AND token = 'cvOJCC7N/pulLoimBUFZ++Sg5Eidh1SwDx82ZMsBdds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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