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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509c58cf9ce47d7c28331d7184c79495d26865b3708a386754c3f650814f7fe5' 
  AND token = '3mFS9vwT6LB5Vv1cLTftB/QwAmoGSGezmBQAVSebHEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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