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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8404bded286f7e6bedaeeacf5463dfa4b1366cdc69f4a04af17682fa75b8fa5a' 
  AND token = 'nM+AL6/3uhe2B5l8SbDSNr6L9b0RgH89lXrrq8WukHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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