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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cdd8dfed4c89b0c396a8e6dac7420c566186b8140d6b356edd8d6f9ab1f21e' 
  AND token = 'R8kvIu98VBgzdj70+XPUcTou/VwE99truj7N3BQeXAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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