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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd029713eebff655b0b42f6f56d7e44d455de02478009285703d60a59ba3dc1fa' 
  AND token = 'eS0psjylBqvgs+fiYn/lEtl1C4IArRbAnareIn8P/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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