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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34eecdb47077c1d4920c975cfc09d8e7899e20309150c1ede7d88772018e88c5' 
  AND token = '5rR/WjV+oIfKvVJ3infPxGYm2mE7wcXrrt5dAjZ7ATA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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