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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c8b2e007f8a4f3099f829d8db46a8a1a63ab3161cc89f82ba962f5aa694db2' 
  AND token = '+8T/B9XxW07jdnTwLI80I5gOoUKgeDWHmchgU9oLuQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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