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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5203f0342c3013bda90cde0fccbdbb4d04bcd7f2ae4a25e3eb7d8f5ad4d1ebd7' 
  AND token = 'Di4nmFFS1bW5pZVQ11Y8c6c2y6c7YQiWm1Xy3TEdBY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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