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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e6b6b80bc8efcb8258d9fec038ce2daad2c68bb58eacf6c419ca250b7c9608' 
  AND token = 'KqVD6AD8jTFamtwR0CYInKLWwPnl+J0xseL4sFuEqiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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