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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a7863ee8af9a4ac5e978ccb994de8fe6d557a73b9a4faa317e90b4b9760906' 
  AND token = 'mE473rl07lWAhcRTSHGg1cy+TPup+ovWn19HymOJllI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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