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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817e0fb906a3a7efb90d63f38436e51c967dff0ee42a50b1b71c7c63df8dcb10' 
  AND token = 'acVbqb1JR+w/MCeer0LN9stY1Wj/3K6uYApsxgpJ+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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