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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5f6ae895619f74bfa0236b0d31eecc91a24266e46e4a0ac9677bb1fe062655' 
  AND token = '+agk/rkjm4fSU5KV7giXw55HVIQdErYo6eI6CE4JtuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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