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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42448db3fc0fa0f16373459c534d195becc31f931a4e3191609b2ea42f13b9be' 
  AND token = 'SsewiaA/EAztL37UbcMnlh3cKKIWNQEAUxLbEIaGG7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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