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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6e48a9c96fb69a70e0f2669cf96a9f91c90cbc418ba824aeca3ef125c13119' 
  AND token = 'kQfcIBiWzcD613sIF+pbDuy9TEuVBN92xS2ICpDMxWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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