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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362b2c70ebec8cad14be4d2f8aab5b3f8fb8b80f10bc36c0a96213c2e4824855' 
  AND token = 'faNrU5MGXxYJIEPAPt9ShOMJLF3DXbb/OvIjM19Akhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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