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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585cede654468e8d585fc61159c5f41cb4733695d443a06657da56c46b2663f4' 
  AND token = 'iN/FjYN9DJUAhPveZ+Cvd1u+TY/dkosqvsRM3dNbc1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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