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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1664295d6ef9fe327e7048bc25e1c1172e4e4169f321438b159ba304fc1f72a7' 
  AND token = 'lv2ju5B3NMg9bo0FTBwTiZ+3nuZdtFvERgycGr1h648=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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