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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a5d0b64c64fd001b7c7194c29636b1773a28edb1b33f2810107a4a26920dda' 
  AND token = '8PxQ4+5ZXOYj0e1se/o6+1yWmsOqQDh6LwhaIDyJAp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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