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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2903c9f973cb728ec7a0daa02d248a37bd4b1a6cdc2f17569979961c70258f3' 
  AND token = '4THsnTqNQFC8N0Ia3OD6hx815xXf5RG9le9G6iaHbbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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